In addition to writing books and overseeing the "supertopo empire," Chris has found some time to make instructional videos on big wall climbing. In the following two videos, he discusses fundamental techniques for using jumars (mechanical ascenders) on a fixed line in a big wall setting:

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Climbing, skiing and mountaineering are dangerous sports. When you undertake an outdoor, backcountry, or an alpine adventure without a guide, you assume total responsibility for your decisions and wellbeing. Conditions in the mountains are constantly changing, and no guidebook or computer web blog can take the place of solid training and experience. Though this site features descriptions of roads, trails, climbing routes, and other natural features, you cannot assume that because something is described here that it has not changed since last observed or that it will be safe for you or your party.
AAI assumes no responsibility or liability for your use of the information presented in this blog. With regard to all backcountry travel and climbing, you must make your own assessments and decisions, and you assume all risks in applying them.